Science:Math Exam Resources/Courses/MATH105/April 2014/Question 01 (c)
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Question 01 (c) 

Let . Find . 
Make sure you understand the problem fully: What is the question asking you to do? Are there specific conditions or constraints that you should take note of? How will you know if your answer is correct from your work only? Can you rephrase the question in your own words in a way that makes sense to you? 
If you are stuck, check the hint below. Consider it for a while. Does it give you a new idea on how to approach the problem? If so, try it! 
Hint 

Use the chain rule. Differentiate first with respect to , treating as constant, and then with respect to treating as constant. 
Checking a solution serves two purposes: helping you if, after having used the hint, you still are stuck on the problem; or if you have solved the problem and would like to check your work.

Solution 

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Please rate my easiness! It's quick and helps everyone guide their studies. First, take the derivative with respect to using the chain rule and treating as a constant. Then use take the derivative with respect to using the product rule and the chain rule: 